[bot-for-go]

Hi! I'm a bot, and this is an automatically generated upstream sync PR. 🔃

After submitting the PR, I will attempt to enable auto-merge in the "merge commit" configuration.

For more information, visit sync documentation in microsoft/go-infra.

Upstream commits included in this update

• 9c8f4b0ab1 cmd/internal/obj/wasm: avoid widening 32-bit import results
• 152b1d604b runtime: fix preempt code to build on POWER8
• b553a7cb8a cmd/internal/obj/arm64: add LDSMAX, LDSMIN, LDUMAX, LDUMIN instructions
• b0d3d283f1 cmd/internal/obj/x86: reject high byte registers with REX prefix
• 412f013cf8 runtime/pprof: use synthetic mappings for WebAssembly profiles
• 69fe0c724a cmd/compile: fix CMPUconst/SRDconst comparison folding on s390x
• aa94415944 cmd/go: use slices.DeleteFunc
• 38d4973e8e cmd/go: fix GoFiles data race on cgo outputs
• 5be815fece cmd/compile: save and restore base.Pos in noder.reader's assign handling
• 9d6658994c test: add regression test for go.dev/issue/76744
• f7fdf08304 crypto/internal/fips140/nistec: add P-256 assembly implementation for loong64
• 44ebbb84a2 crypto/sha512: add LSX-accelerated block function for loong64
• b656fdc3c3 runtime: fix V3 not cleared in LSX register-erase path on loong64
• f94525c6b5 crypto/internal/fips140/aes: pre-swap enc[] round keys to state order on loong64
• 9350068b23 cmd/internal/obj/loong64: optimize the function stacksplit implementation
• 834fd9ec2d internal/chacha8rand: remove unreachable RET in loong64 block
• ebb3cf2d9b reflect: unify retValid initialization on loong64
• 210f033140 cmd/internal/obj/loong64: add unary destination instruction table
• 9586e4b65c cmd/go: make chdir.txt independent of cached vet results
• 0733e10fa8 simd/archsimd/_gen: document how to test on other platforms
• b082320566 cmd/internal/obj/ppc64: add VSX vector single-precision arithmetic
• 3a5e97de8b runtime: fix openbsd/arm64 virtual address size
• 0b050a4c5c encoding/json/jsontext: fix Reset with nil
• 2b3d65099b os/user: document that Current, Lookup and LookupId may use the environment
• 4688df3529 internal/poll: don't drop TransmitFile errors in Windows SendFile
• 6d79995d3b cmd/compile: make location list data structures smaller
• f3e4f788ed cmd/compile: keep the typelink when upgrading a noalg descriptor
• 76ba5bf217 runtime: preserve callee-saved registers in tstart on AIX
• 9823ced63e cmd/compile/internal/ssacompile: don't move InitMem in tighten pass
• 93a285f2bc internal/profile: reject dangling location IDs in Parse
• eeec749e5f cmd/compile/internal/ssa: export bitset for CL 813140
• 501a974c6b cmd/compile/internal/ssa: panic only on memory phis in Value.MemoryArg
• 330038a1df strconv: fix bug in Unquote(`'\xXX'`)
• 8db4546f29 simd: lower signed GetElem to VSMOV instead of VMOV
• b01fe21278 cmd/internal/obj/arm64: add VSMOV instruction
• 564dc2751f archive/zip: stop OOM'ing on race builders by skipping TestZip64LargeDirectory
• 564f7d071a cmd/compile, cmd/link, runtime: distinguish pointer and register widths
• c0e943774b encoding/json/v2: document that an UnmarshalJSONFrom implementation should not retain its receiver
• 430d19f07a go/types, types2: pass target type for comparing untyped comp lits
• 205624aac7 go/types, types2: pass target for switch
• 96ef5b334c go/types, types2: pass target type for copy(s1, s2)
• 08a51e4d9b go/types, types2: pass target type for append(s, e) / append(s1, s2...)
• 615968e2b6 go/types, types2: remove comment that outlived its usefulness (cleanup)
• f1220f3337 go/types, types2: pass target type for delete(m, k)
• 9cfb1104a4 cmd/dist: add -debug-trace to dist test and all.bash
• 18d746bc25 cmd/compile: unset addrtaken for single-block mem2reg promoted vars
• 958aac0d81 simd/internal/spec: fix MulAdd to actually do FMA
• 6acc64e461 simd/internal/spec: fix Div for ints
• e2889b0bf5 cmd/compile: fix operand order when lowering mask AndNot to KANDN
• 33e2e22c8e net/http/internal/http3: cancel request context before closing response

View full diff on GitHub

[review-bot-for-go]

Thanks! Auto-approving.

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[Copilot]

🔵 Needs a closer look

The missing PR diff, changed-file list, and populated go/ submodule prevent verification of the upstream changes and their compatibility with Microsoft’s patches.

No open issues 🎉

What changed in this PR

This automated sync updates the Go submodule to upstream commit 9c8f4b0ab1, bringing recent upstream changes into the Microsoft build of Go.

Changes:

• Incorporates compiler, runtime, and standard-library correctness fixes.
• Adds architecture-specific instruction support and optimizations, alongside test and documentation updates.

File	Description

_{Review effort: Balanced}